The Calligra Office Suite has announced its second snapshot release. The project, which is a fork of KOffice, is building a suite of productivity and creativity applications and is working towards its first formal end-user release due in October. The project is seeking feedback from end users particularly in the area of usability of the GUI. With this snapshot Calligra Office Words is claiming better compatibility with .docx than LibreOffice, and also claims to be approaching the best compatibility with legacy .doc formats.

I think it is. Look at the comments in that link. And you can take a look at koffice.org, there is a blog entry about the different directions that developers were having. And because of that, they had to fork koffice into calligra.